three.js/src/lights/HemisphereLight.js

/**
 * @author alteredq / http://alteredqualia.com/
 */

THREE.HemisphereLight = function ( skyColorHex, groundColorHex, intensity ) {

	THREE.Light.call( this, skyColorHex );

	this.position.set( 0, 100, 0 );

	this.groundColor = new THREE.Color( groundColorHex );
	this.intensity = ( intensity !== undefined ) ? intensity : 1;

};

THREE.HemisphereLight.prototype = Object.create( THREE.Light.prototype );

THREE.HemisphereLight.prototype.clone = function () {

	var light = new THREE.PointLight();

	THREE.Light.prototype.clone.call( this, light );

	light.groundColor.copy( this.groundColor );
	light.intensity = this.intensity;

	return light;

};